Oil pilot device for tray type oil burners



Sept. 27, 1949.

K. S. JENSON OIL PILOT DEVICE FOR TRAY TYPE OIL BURNERS Filed Feb. 11, 1946 kzzzzezfi 5 15725012,

Patented Sept. 27, 1949 01L PILOTDEVICE FOR TRAXTYPE, 7 oIL BURNERS a 1 7 Kenneth S. Jonson; Wisconsin Rapids; as

signer to Prentiss Wabers Products 0.0,, W s? consinRapids, Wis. a corporation o'i Wisconsin Ap ueauonr'ebmary 11, 1946; Serial No, eraser aclaims. (01.. 15.8 91);

The present invention relates toimprovements in oil pilot devices. More particularly the present invention relates to improvements in oil burners. with. particular itylocated slightly abovertheupper region, of they overflow weir Ft. The depressed po i nl6 provided with a furlther depressed portion 22, which provides a sump forholding-a small supply reference lac-features thereotrelating; to; the pro- 6 of'oil or other fuel-,fiotproviding a pilot, flame; visionv of. a pilot. flame. The numeral Zsindioates-a housing disposed An Object of h present invention is to -pr above. the depressedportion. 1 6.... Said housin has vide an oil burner having improved means 'for art-opening, 2dr therein through. which oil. or other delivering air thereto-l. f -uel maybe-admitted; thorn the; inlet. t8. At the A/ further object is to'provide. an oil pilot for 10 end of the housing: distant. from the opening2 l an oil burner which has the; advantage that air is,- the pilot flame throat, 2 5, this being an opening for combustion-is drawn irom aregion below the located adjacent tothebottom l.l,. Disposed in normal oil level, in the, burner pot, through a alignedaperturesin the. depressed, portion i=6. of coursev of travel which is heatedby the pilot the bottom II and in the housing 23; is. the pilot flame. inlet tube 2i, approximately verticallydis- A further object is. to provide an improved oil pilot -device which is simple: anclsturdy in construction and certain in operation.

A further object is to; provide; an mproved oil pilot well adapted tomeet the needsof ordinary service. e A

Further objects will :appear the description proceeds.

Referring to the drawingse- I Figure l is a fragmentary view in. section, the section beingtakenalong the plane indicatedby the arrows l-J of Eigurem- Figure 2 is a sectional view inelevation, said sectional view being, takenalong the plane indiposed, which provides communication fr m th region below the depressed portion It. to. the regionabove-theghouslnglih l Disposed inyef-elooing; relationship. with the upper portion. oi thchousing, 23 is the enclosure or housing 21, which provides a plenum chamber 28. above the housing. Z3,. j'Izhev upper wall of the housing 231s provided with the pilot. primary air ports 29 -29! and-. with the. pilot.- secondary air ports 3.0; The axes. of the air-"ports. 29. may be substantially vertical, whereby'to direct air more or less directly downwardly and that Part of the housing 23,. relatively distant from the throat 25. The ports 30. may be. directed angularly, whereby cated by the arrows 2-21}? Figure l; and V 30 air from the plenum chamber 28. will be diverted V Figure- 3 is a sectional View taken along the moredirectly to, the 'throatli.

plane indicated. by'the arrowsB-h oi Figure 2. The housing 23 andthe. enclosure or housing 21 The bowl portion of. aburner indicatedby may be welded, together and to the cylindrical the numeral I.B,saidbowlportion having a dished wall. L2,. or may be attached by any other prebottom I I and a vertical annularwall I2, the wall 3;, ferred means. A bracket. 31 may be employed to I2 being swedgedoutwardly a small amount at secure the housing 21 to thefiwall l l.

its upper extremity, as indicated by the numeral In, operation, thejfvalve 2]). will control the flow l3, for the reception of the cylindrical wall I4 015 tuel to, the hurne'r'. Said valve: may be either which housesthe mixing chamber of the burner. manual or aut.oniatic,,.;and in accordance with Said cylindricalwall M is. provided with the usual i0 ommon practice. be shu compl tely; m y

apertures for admitting air for combustion to said mixing chamber, said holesbeing indicated by the numerals l.5-l5. Itwill'be understood, of course, that the burner may be. located within a housing of any preferred shape.

The bottom III of the. burner adjacent to the cylindrical wall I; is'provided with agdepressed portion 16 defined byan overflow weir ll. Said depressed portion provides a reservoir for oil or other fuel at a region oithe bottom portion H adjacent to the cylindrical wall l2. The numeral I8 indicates an oil inlet. which may be fed by a supply pipe 19 controlled by a valve 20 which controls thedischarge of fuel from the supply pipe 2 l, The inlet 18 may, have its lowermost extrembe. setto. maintaina, nooljoi oi in the, sump 22; or'may be. adiustedtojprovide. any desired oil p Consideringv conditions when it is desired to maintain a pilot fitame within. the burner, the valve 20, will be adjusted to maintain a, small pool of oil or. the like within the sump '22. Combustionof, the oil in this sump will maintain the housing 23 and the tubeld as well as the parts associated with; these members, in a-heated condition. A flow of airis, inducedrupwardly through the tubeI-G from theregion below the bottom of the burner to the plenum chamber-'28, whence the air will be directed downwardly through the ports 29 and 30, through thethroat 25. The mixrture of oil and air within the housing 23 provides a combustible mixture burning with a low flame at or adjacent to the throat 2 5. The transfer or heat from the burning oil in the sump 22 will also produce the advantage that the oil in said sump will be protected against excessive heatingso that in theevent of cessation or fuel supplied from the pipe I9, the amount'of fuel in the sump 22 will not be depleted promptly and fire will be maintained in the sump for .a mate-' rial length of time until the nextdrop o f fuelis admitted from the pipe l9. When a higher fire is required, the flow of oil will lbe increased through operation of the valve-20,, oilwill flow gradually over the weirurana will be distributed circumferentially as well as radially into the depressed bottom portion lil -Due to. the richness of the mixture within the housing 23 at this time, the pilot flame will be extinguished at the throat 25, the flame being transferred to the fuel in the bottom l j of the burner. Combustion of the fuelin th bottom] I may be controlled in the conventional manner hyadlustment of thevalve H When it is desired to eirtinguish the flame within the bottom I I, the valve 20 will be throttled to a point where onlyfsuilicient oil-will be delivered to maintain a small poolwithin the sump 22. The flamewill recede "cm the bottom ll of the burner to the throat; 2 H he reduced richness of the mixture. within the housing 23 permitting the maintenance ot combustioin within the housing 23, thereby maintainingthepilot flame at or adjacent to the throat 25.

Air for combusti-on'ror thepilotflame is drawn from the region below the burner to the plenum chamber 28, the air-passing .thrfo ughthe heated region surrounding the tube 2 t. Improved control of combustionwithin the housing 23 is thereby accomplished, resulting inimproved certainty of action of the pilot flamej i Though a preferred embodiment ofthe present invention has been described in detail, many modifications will occur, to thosejskilled in the art. llt is intended to cover all such modifications that fall within the scopepfthe appended claims.

What is claimedis;

1. In a burner, in combination, means providing a oombustionchamber having, a bottom of dished conformation, meansproviding a mixture chamber located atone sideof said bottom, said last mentionednieans, having apertures at the top thereof for the admission of air rto said mixture chamber, awall mounted above said last mentioned means and spaced, from said last mentioned means to provide a passageway for air to said apertures, a vertically disposed tube extending through said'mixture chamber and providing communication for combustion air from a level below said bottom mean passageway, and an oil inlet to said burner atsaid one side thereoisaid bottom being provided with a depressed portion e t to vsaid n t a d de res ed P o b ing defined by, aweir for' distributing fuel circumferentially andradiallyjinto saidbottom of dished formation, said depressed portion being further depressed to provide ,a sump I01 old a small supply of fuel, said'tube being in thermal communication with-said depressed portion.

' 2. In an oil burner, in combination, means providing a combustion 'ehamber' having a dished bottom, a portion adjacent'tofthe edge of said bottom being depressed to pro ide a reservoir rounded y a liqui no 1:. i ro fi weir, s i \epressed portion at a region adjacenit to the 4 edge of said bottom being further depressed to provide a sump for fuel for a pilot flame, said oil burner being apertured for the delivery of liquid fuel to said depressed portion and said sump, a housing over said depressed portion, said housing having apertures in its upper wall, an enclosure over said housing to provide a plenum chamber communicating with saidapertures, and a tube extending through said housing and providing communication for air from :a region below said bottom to said plenum chamber, said tube being in thermal communication with said sump.

, 3. In an on burnenin combination, means provicmg-a combustionchamber having a dished R bottom, a pontion'adjacent to the edge of said bottom being depressed to provide a reservoir bounded by a liquidpfuel distributing weir, said depressed portion at a region adjacent to the edge of said bottom :being further depressed to provide a sump for fuel for apilot flame, said oil burner being -apertured for the'd'elivery or liquid fuel to said depressed portiomand said sump, a housing over said depressed' qmon, said housing having apertures in its upper Wall, an enclosure over said housing-"to provide a plenum chamber communicating with saidapenture's, and a tube extending through said housing and-providing communication for air from a region below said bottom to said plenum chamber, said tube being in thermal communication with" said sump, said housing having a pilot flame throat directed toward the aXis of said burner, certain of said apertures adjacent to the outer periphery of said burner being shaped to dir'ect'air approximately vertically downwardly, certain of said apertures closer to the axis of saidburner being shaped to direct air downwardly and angularly toward said throat. "j

4. In an 'oilburner, in" combination, means providing'a combustion chamber having a dished bottom, a portion adjacent to the edge of said bottom being depressedto-provide a reservoir bounded by a liquid fuel distributmg weir, said depressed portion at a region" adjacent to the edge of saidbottom being'idrther depressed to provide a sump for liquidfuel for a pilot flame, said oil burner being apertured'for the delivery of liquid fuel to said depressed portion and said sump,'a housing over saiddepressed portion, said housing having apertures in its flipper wall, an enclosure over said housing to provide a plenum chamber communicating with v 1 said apertures, and a tube extending'throughf'said housing and providing communication of air from a region below said bottom to saidplenum chamber, said tube being in thermal communication with said sump. 1

V 5. Inan oil burner, in combination, means providing a combustion chamber having a dished bottom, a portion adjacent to the edge of said bottom being depressed to provide a reservoir bounded by a liquid fuel distributing weir, said depressed portion 'ata region adjacent to the edge of said bottom being lif-uiwther depressed to provide a sump for liquid ruel for a pilot flame, said oil burner being apertured for the delivery of liquid fuel to said depressed portion andsaid sump, a housing over said depressed portion, said housing having apertures in its upper wall, an enclosure over said housing toflprovide a plenum chamber communicatin g jwith said apertures, and a tube extending through said housing and providing communication or air from a region below saidjbottomto, said plenum chamber said tube being in thermal communication with said sump, said housing having a pilot flame throat directed toward the axis of said :burner, certain of said apertures adjacent .to the outer periphery of said burner being shaped to direct air approximately vertically downwardly, certain of said apertures closer to the axis of said burner being shaped to direct air downwardly and angularly toward said throat.

KENNETH S. JENSON.

REFERENCES CITED The following references are of record in the file of this patent:

Number UNITED STATES PATENTS Name 7 Date Jenson June 20, 1939 Donley Apr. 13, 1943 Hayter May 23, 1944s Breese et a1 Jan. 9, 1945 Livar Feb. 20, 1945 Livar et a1 Jan. 15, 1946 

